Solar · Error codes · Fronius International GmbH
515Fronius International GmbH · Fronius SnapINverter (Primo, Symo, Eco, Symo Hybrid)
515 on a Fronius International GmbH Fronius SnapINverter: Unable to communicate with filter
Short answer
On a Fronius International GmbH inverter, 515 means: Unable to communicate with filter. The inverter keeps running. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Unable to communicate with filter.
Part involved: filter board.
When it shows: Class 5 status code.
Likely causes:
- If displayed all the time notify Fronius-trained service engineer.
Is it safe?
| Does the inverter stop? | No |
|---|---|
| Severity | Warning |
| Engineer needed? | Yes |
The inverter keeps running.
Resetting itself: no.
Manual reset: Acknowledge on display (Enter key).
What you can check
- Read the state code on the inverter display or in Fronius Solar.web and note date/time for your installer.
- Contact installer if permanent.
What the engineer will check
- Fronius Service.
Who to ask for: Fronius-trained PV installer / Fronius Service Partner.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- Fronius Primo 3.0-1 - 8.2-1 Operating Instructions (HTML) ↗ · 42,0410,2165 online edition · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026